The view pg_timezone_names
provides a list of time zone names that are recognized by
SET TIMEZONE, along with their
associated abbreviations, UTC offsets, and daylight-savings
status. (Technically, PostgreSQL
uses UT1 rather than UTC
because leap seconds are not handled.) Unlike the abbreviations
shown in pg_timezone_abbrevs, many of these names
imply a set of daylight-savings transition date rules. Therefore,
the associated information changes across local DST boundaries.
The displayed information is computed based on the current value
of CURRENT_TIMESTAMP.